It seems Kasdan and Kinberg have indeed been hired to work on Disney's new Star Wars movies, it won't necessarily be episodes VIII and IX that they will be writing. THR reveals that it could be some of the spinoffs that will be part of the “every two to three year” plan set for the new saga that the two will work on. The site also mention the "Skywalker storyline", confirming what we had pretty much already figured - the initial series of movies at least, will indeed revisit the characters from the original trilogy.
From THR..
"Their scripts could turn into official “Episodes” in the main Skywalker storyline, or they could form the basis for spinoffs focusing on side characters. Disney CEO Robert Iger said the goal is to release a Star Wars movie “every two to three years,” and some could easily focus on other pieces of the expansive mythos (similar to Marvel’s Avengers universe). Disney and Lucasfilm declined comment."
So which characters would you like to see become the focus of the spinffs? Obviously Bobba Fett is a popular one, but personally I'd like to see the continuing adventures of that poor one-armed, Walrus-faced bastard Ponda Baba. Sound off below.